The diploma thesis is focused on costs, calculation and primarily analysis of calculation systems and formula. The thesis is divided into two main parts – theoretical and practical part. The theoretical part is focused on explanation between financial and management accounting, description of basic terms and expense classification. Attention is given to system of calculation, its items, and calculation formula. Mention belongs to modern access of calculation – ABC. Practical part is focused on company Prefa Brno a.s., which main part of business is production and sale of building products and components. Shortly is mentioned characteristic of company, its history, present, sales and SWOT analysis. The main orientation of diploma thesis is o...